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고진공 다이캐스팅 공법 적용한 알루미늄 서브프레임 개발
조영건(Younggun Cho),임태성(Taeseong Lim),장상길(Sang-gil Jang),조철환(Cheol-hwan Cho) 한국자동차공학회 2012 한국 자동차공학회논문집 Vol.20 No.4
The subframe has been generally manufactured by using stamped steel material. Recently, automotive designers are considering aluminum as lightweight material. This paper describes the development process of an aluminum subframe which is made by high level vacuum die casting process, which is beneficial for minimizing gas contents and material properties. The weight of manufactured subframe is reduced by 4kg with the comparison of steel subframe. The aluminum subframe is packaged for the current vehicle layout and the imposed requirement is to attain a better structural performance that is evaluated in terms of mounting stiffness, noise and vibration, and endurance performance. The NVH evaluation results show that sound level is decreased by 8dB with the help of high roll-rod mounting stiffness as well as high structural modes.
파이프 인서트 기술을 적용한 알루미늄 고압주조 부품개발
강문구(MunGu Kang),윤형섭(HyungSop Yoon),이철웅(CheolUng Lee),임태성(TaeSeong Lim),김성진(SeongJin Kim),윤광민(KwangMin Yoon) 한국자동차공학회 2022 한국 자동차공학회논문집 Vol.30 No.1
Recently, shaped components, from which oil or cooling water flows, have been produced. In order to fabricate the components produced by the High-Pressure Die-Casting(HPDC) process, such as oil-path, the deep hole-drilling method has been applied. However, it causes problems like oil leaks or cooling water leaks because HPDC products have plenty of defects, such as shrinkage or large pores. In this investigation, the pipe-inserted aluminum rear cover component was fabricated by HPDC. Instead of conducting hole-drilling on the rear cover, a pipe was inserted on the mold before casting during HPDC. Hence, defect exposure by post-machining was fundamentally blocked. A theoretical formula was derived in which the inserted pipe of the HPDC component was not deformed under a certain intensification pressure of HPDC, since there is a relationship between the HPDC processing parameter and the mechanical properties of the inserted pipe. Based on the theoretical formula, the relationship between the HPDC parameter and pipe deformation was proved in the experiment.